Envisage opponent capturing rook with check (7)
I believe the answer is:
foresee
'envisage' is the definition.
(foreseeing is a kind of envisaging)
'opponent capturing rook with check' is the wordplay.
'opponent' becomes 'foe' (I've seen this before).
'capturing' indicates putting letters inside.
'rook' becomes 'r' (abbreviation in chess).
'with' is a charade indicator (letters next to each other).
'check' becomes 'see' ('see' can be a synonym of 'check'**).
'foe' enclosing 'r' is 'fore'.
'fore'+'see'='FORESEE'
(Other definitions for foresee that I've seen before include "witness in advance?" , "Imagine" , "Envisage" , "divine" , "Expect" .)