Crossword Genius

Grip shellfish with power (5)

Ross

I believe the answer is:

clamp

'grip' is the definition.
(I've seen this in another clue)

'shellfish with power' is the wordplay.
'shellfish' becomes 'clam' (clam is a kind of shellfish).
'with' means one lot of letters go next to another.
'power' becomes 'p' (symbol in physics).
'clam'+'p'='CLAMP'

(Other definitions for clamp that I've seen before include "Secure - store for potatoes" , "Wheel immobiliser" , "Heap of potatoes" , "Strong fastener" , "that stops one from driving?" .)

I've seen this clue in The Sun.
Want a hint initially instead of a full solution? Install my app