Crossword Genius

Hold cold fish (5)

Ross

I believe the answer is:

cling

'hold' is the definition.
(I know that cling is a more specific form of the action grasp)

'cold fish' is the wordplay.
'cold' becomes 'C' (eg on taps).
'fish' becomes 'ling' (ling is a kind of fish).
'c'+'ling'='CLING'

(Other definitions for cling that I've seen before include "Be emotionally over-dependent" , "Hold on tightly, refuse to abandon" , "Hold on as for dear life" , "Hold, cleave" , "fast" .)

I've seen this clue in The Telegraph.
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