Nowadays on edge about lover (7)
I believe the answer is:
admirer
'lover' is the definition.
(admirer is a kind of lover)
'nowadays on edge about' is the wordplay.
'nowadays' becomes 'ad'.
'on' becomes 're' ('on' can be mean 'with reference to').
'edge' becomes 'rim' (rim is a kind of edge).
'about' says the letters should be written backwards.
're'+'rim'='rerim'
'rerim' back-to-front is 'mirer'.
'ad'+'mirer'='ADMIRER'
(Other definitions for admirer that I've seen before include "sweetheart" , "One who cherishes, like boy friend" , "Married to one who cherishes" , "Hopeful lover?" , "Married (anag) -- lover" .)