Crossword Genius

Lad seen swimming with fish (4,3)

Ross

I believe the answer is:

sand eel

'fish' is the definition.
(sand eel is a kind of fish)

'lad seen swimming' is the wordplay.
'swimming' indicates anagramming the letters.
'lad'+'seen'='ladseen'
'ladseen' is an anagram of 'SAND-EEL'.

'with' acts as a link.

(Other definitions for sand eel that I've seen before include "Very small fish that burrows into beaches" , "Shallow-water fish" , "swimmer" .)

I've seen this clue in The Independent.
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