Jumper always having hole in it? (7)
I believe the answer is:
eventer
'jumper' is the definition.
(I've seen this before)
'always having hole in it?' is the wordplay.
'always' becomes 'eer' (poetic way of saying ever).
'having hole' becomes 'vent' (I can't explain this - if you can you should believe this answer much more).
'in it?' indicates putting letters inside.
'eer' going around 'vent' is 'EVENTER'.
Can you help me to learn more?
(Other definitions for eventer that I've seen before include "Equestrian competitor" , "Showjumper" , "Competitive rider" , "competitive horse" , "Competing horse or rider" .)