Runner has love for party (5)
I believe the answer is:
beano
'for party' is the definition.
(I've seen this before)
'runner has love' is the wordplay.
'runner has' becomes 'bean' (I can't explain this - if you can you should believe this answer much more).
'love' becomes 'o' (love means zero in tennis).
'bean'+'o'='BEANO'
Can you help me to learn more?
(Other definitions for beano that I've seen before include "A bone for a feast" , "Informal party" , "Comic - party" , "Comic and informal get-together" , "rowdy festivity" .)