Minute romances, sadly out of proportion (14)
I believe the answer is:
incommensurate
'out of proportion' is the definition.
(thesaurus)
'minute romances sadly' is the wordplay.
'sadly' indicates an anagram.
'minute'+'romances'='minuteromances'
'minuteromances' is an anagram of 'INCOMMENSURATE'.
(Other definitions for incommensurate that I've seen before include "out of all proportion" , "it's not enough" .)