Crossword Genius

Crustacean is lean crab, minced (8)

Ross

I believe the answer is:

barnacle

'crustacean' is the definition.
(barnacle is a kind of crustacean)

'lean crab minced' is the wordplay.
'minced' indicates anagramming the letters.
'lean'+'crab'='leancrab'
'leancrab' with letters rearranged gives 'BARNACLE'.

'is' acts as a link.

(Other definitions for barnacle that I've seen before include "Clinging sort" , "Crustacean that attaches to underwater surfaces" , "type of goose" , "hanger-on" , "'Marine crustacean, attaches to a boat-hull (8)'" .)

I've seen this clue in The Times.
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