Running tavern, taking time writing menu including starter of haggis (10)
I believe the answer is:
publishing
'running' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps you can see an association between them that I can't see?
'tavern taking time writing menu including starter of haggis' is the wordplay.
I cannot really see how this works, but
'tavern' could be 'pub' (pub is a kind of tavern) and 'pub' is found within the answer.
'starter' could be 'l' (as in a learner driver with L-plates on their car) and 'l' is found within the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Another definition for publishing that I've seen is " Announcing".)