Shocking forbidden passion -- love found by you and me (10)
I believe the answer is:
outrageous
'shocking' is the definition.
(I've seen this before)
'forbidden passion love found by you and me' is the wordplay.
'forbidden' becomes 'out' (synonyms).
'passion' becomes 'rage' (synonyms).
'love' becomes 'o' (love means zero in tennis).
'found by' means one lot of letters go next to another.
'you and me' becomes 'us'.
'out'+'rage'+'o'+'us'='OUTRAGEOUS'
(Other definitions for outrageous that I've seen before include "Exorbitant" , "undignified" , "Shocking" .)