A bit of a pig maybe sets out to live in them (5)
I believe the answer is:
sties
'live in them' is the definition.
I can't tell whether this defines the answer.
'a bit of a pig maybe sets out' is the wordplay.
'a bit of a pig' becomes 'i' (I can't explain this - if you can you should believe this answer much more).
'maybe' indicates anagramming the letters.
'out' indicates putting letters inside.
'sets' anagrammed gives 'stes'.
'i' going inside 'stes' is 'STIES'.
'to' acts as a link.
Can you help me to learn more?
(Another definition for sties that I've seen is " Places for pigs".)