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15d. Whiffs of fish start to escape aboard ship (8)
S - E - C - E -
3d. Run around , trapped by unusually big predators (5)
- - C - - ORCAS ?
11a. Thrash sides in financial trouble (5). - - - - -
5a. Switch feet from right to left (4) - - - -

Stenches
Orcas
Flail
Swap

15d: stenches = wiffs (def)
tench - fish
e - e(scape)
SS- ship

3d: orcas = predators (def)
r - run
ca - around
OS - unusually big

11a: flail = thrash (def)
fl - f (inancia) l
ail - trouble

5a: swap = switch (def)
paws - feet (reversed)

Thank you both.

You're welcome, Shipwreck!