Waylay a doctor with American husband (6)
I believe the answer is:
ambush
'waylay' is the definition.
('ambush' can be a synonym of 'waylay')
'a doctor with american husband' is the wordplay.
'doctor' becomes 'mb' (Bachelor of Medicine, Medicinae Baccalaureus**).
'with' is a charade indicator (letters next to each other).
'american' becomes 'us'.
'husband' becomes 'h'.
'a'+'mb'+'us'+'h'='AMBUSH'
(Other definitions for ambush that I've seen before include "Weakening" , "An attack launched from hiding" , "Waylaying" , "(Where enemies) lie in wait" , "Wait in hiding to attack" .)