Wolf losing head at wild Northern Irish party will have them in creases (4,2)
I believe the answer is:
fold up
'wolf' is the definition.
Although both the answer and definition are verbs in their base form, I can't see how they can define each other.
'losing head at wild northern irish party will have them in creases' is the wordplay.
I cannot really understand how this works, but
'northern' could be 'up' (eg in the term 'upstate') and 'up' is present in the answer.
'party' could be 'l' and 'l' is found within the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for fold up that I've seen before include "Bend into a flatter shape" , "Double over" .)