Crossword Genius

See a key agent (4)

Ross

I believe the answer is:

espy

'see' is the definition.
(thesaurus)

'a key agent' is the wordplay.
'a key' becomes 'e' (I've seen this in other clues).
'agent' becomes 'spy' (spy is a kind of agent).
'e'+'spy'='ESPY'

(Other definitions for espy that I've seen before include "Detect" , "Discern" , "Behold" , "Observe (arch.)" , "See" .)

I've seen this clue in The Telegraph.
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