Is it not here that you may find three? (5)
I believe the answer is:
there
'not here that you may find three?' is the definition.
'there' can be an answer for 'not here' (I've seen this before). I'm not certain of the rest of the definition.
'is it' is the wordplay.
I cannot really understand how this works, but
'it' could be 't' (abbreviation. e.g. in 'tis) and 't' is located in the answer.
The remaining letters 'here' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for there that I've seen before include "Ether (anag)" , "Place: as indicated" , "In that respect" , "Expression of comfort" , "Thither" .)