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Great, thanks Malone.

18a Archaic old word for "wash" the same when reversed
MEDIEVAL

15a. Abysmal professional cast
PROFOUND

18d. Pick prize plant grown in this
FLOWERPOT

7d. Vessel's doctor operating inside port
MONOHULL

Parses for the above please.

7 Monohull, vessel.
MO = Medical Officer, doctor
On = operating, working etc
Hull = port
Inside - On goes in the MO

Lave, wash, Idem, Latin for 'the same', reversed/backwards.

15 Profound, abysmal (at the bottom of an abysm, very deep etc). Pro - professional, Found - cast (as in metal, heating/smelting, whatever).

Flower/pick - best of a range
Pot - prize - as in poker

Thanks very much Malone and HW. Understood.

13a. Lug most of the materials for the taskin Offa's Dyke, say
EARTHWORK

25a. The solid figure of a governess
PRISM

5d. Old man and fish
ANGLE

6a. Victory hymn Saint turned out
PALM

26a. Jug handles found largely on little pitchers
EARS

Parses for the above please.

6a. P(s)ALM with the palm leaf being emblematic of victory

25a is a reference to Miss Prism (a governess) in The Importance of Being Earnest