Crossword Genius

Is deep perhaps but may be detected (6)

Ross

I believe the answer is:

espied

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

'is deep perhaps' is the wordplay.
'perhaps' is an anagram indicator.
'is'+'deep'='isdeep'
'isdeep' with letters rearranged gives 'ESPIED'.

'but may be' is the link.

(Other definitions for espied that I've seen before include "Saw (archaic)" , "Watched" , "Spotted; saw" , "Caught sight of (poetic)" , "Caught sight of (archaic)" .)

I've seen this clue in The Globe and Mail.
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