Crossword Genius

Endorses fish or rump

Ross

I believe the answer is:

backside

'rump' is the definition.
('backside' can be a synonym of 'rump')

'endorses fish' is the wordplay.
'endorses' becomes 'backs' ('back' can be a synonym of 'endorse').
'fish' becomes 'ide' (I've seen this before).
'backs'+'ide'='BACKSIDE'

'or' is the link.

(Other definitions for backside that I've seen before include "Rear" , "Bottom" , "Seat" , "Behind" , "Hind part" .)

I've seen this clue in The Guardian.
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