Crossword Genius

Tuna scarce? Switch to crab, perhaps (10)

Ross

I believe the answer is:

crustacean

'crab perhaps' is the definition.
(crab is a kind of crustacean)

'tuna scarce? switch' is the wordplay.
'switch' indicates an anagram.
'tuna'+'scarce'='tunascarce'
'tunascarce' is an anagram of 'CRUSTACEAN'.

'to' is the link.

(Other definitions for crustacean that I've seen before include "seafood" , "crab maybe" , "Perhaps crab" , "Such as a crab or shrimp" , "Such as a barnacle" .)

I've seen this clue in The Times.
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