Beloved trifles, perhaps I adore you (5,8)
I believe the answer is:
sweet nothings
'perhaps i adore you' is the definition.
'beloved trifles' is the wordplay.
'beloved' becomes 'sweet'.
'trifles' becomes 'nothings'.
'sweet'+'nothings'='SWEET NOTHINGS'
(Other definitions for sweet nothings that I've seen before include "words of love" , "Lovers' words?" , "stuff for Valentine cards" , "Whispered endearments" , "whispered words of affection" .)