The team having batted are in the field, not the pavilion (7)
I believe the answer is:
outside
'pavilion' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.
'the team having batted are in the field not' is the wordplay.
I cannot really understand how this works, but
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is found within the answer.
'team' could be 'side' (both can mean a sports team) and 'side' is found within the answer.
'not' could be 'o' (I've seen this in other clues) and 'o' is found in the answer.
A single letter 'u' remains which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
'the' acts as a link.
Can you help me to learn more?
(Other definitions for outside that I've seen before include "Tedious (anag)" , "Alfresco" , "Where smokers now often must go" , "Without" , "Exterior" .)