It's a trap, we note (3)

I believe the answer is:

web

'it's a trap' is the definition.
(web is a kind of trap)

'we note' is the wordplay.
'note' becomes 'b' (musical note).
'we'+'b'='WEB'

(Other definitions for web that I've seen before include "Network; mesh" , "Spider's network" , "Network (maybe worldwide?)" , "Lattice" , "Spider's trap" .)

I've seen this clue in the Evening Standard.

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