Mawkish attempt to invite intimacy at last? (5)
I believe the answer is:
gooey
'mawkish' is the definition.
(I've seen this before)
'attempt to invite intimacy at last?' is the wordplay.
'attempt' becomes 'go' (go is a kind of attempt**).
'at last?' indicates one should take the final letters (I've seen 'at last' mean this).
The last letters of 'to invite intimacy' are 'oey'.
'go'+'oey'='GOOEY'
(Other definitions for gooey that I've seen before include "Sticky" , "Mawkish" .)