Trendy old flame: saucy — and clumsy (8)
I believe the answer is:
inexpert
'clumsy' is the definition.
(I've seen this before)
'trendy old flame saucy' is the wordplay.
'trendy' becomes 'in'.
'old flame' becomes 'ex' (I've seen this in other clues).
'saucy' becomes 'pert' ('pert' can be a synonym of 'saucy').
'in'+'ex'+'pert'='INEXPERT'
'and' acts as a link.
(Other definitions for inexpert that I've seen before include "unprofessional" , "Lacking professional skill" , "Incompetent" , "Offering little professionally" , "Not skilled or well-versed" .)