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Just in case…
fleet: SPRY
blow as in spray from a whale’s blowhole

Application of complex variable parsing. (8)

anag of Y+PARSING

Decorated by Banksy, not even Superman yields. (7)

Garland’s spar performance - Judy’s last (5)

Having seen this in Chambers I can't not use it:

Spouting, or talking about through your ass (8)

or arse, if you prefer. I'm assuming that expression is universal.

SAYING = talking, PR = well, look it up. S(PR)AYING

Roughed up in Dartmoor? Turned out switching wings (7)

Splayed (l)/r

Grind up this branch to make papyrus (5)

Another compound anagram, UP SPRAY --> PAPYRUS.

Tweak to 13:
Decorated by Banksy? Periodically Superman yields. (7)

Painting always in season (8)

Flew on a sunbeam - then applied sunblock? (7)