Competitions for writers on love? (5)
I believe the answer is:
opens
'competitions' is the definition.
(open is a kind of competition)
'writers on love?' is the wordplay.
'writers' becomes 'pens' (I've seen this before).
'on' says to put letters next to each other.
'love?' becomes 'o' (In tennis, 'love' means 'zero').
'pens' after 'o' is 'OPENS'.
'for' is the link.
(Other definitions for opens that I've seen before include "expands" , "Launches" , "Establishes" , "Unfastens" , "Tournaments for both professionals and amateurs" .)