Crossword Genius

Her and it; conjunction or pronoun (5)

Ross

I believe the answer is:

their

I'm a little stuck... Click here to teach me more about this clue!

'pronoun' is the definition.
(I've seen this in another clue)

'her and it conjunction' is the wordplay.
I cannot really see how this works, but
'it' could be 't' (abbreviation. e.g. in 'tis) and 't' is found in the answer.
The remaining letters 'heir' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

'or' acts as a link.

Can you help me to learn more?

(Other definitions for their that I've seen before include "Belonging to those people" , "Possessive pronoun" , "Some would say his (or her)" , "Relating to them" , "Belonging to him (perhaps wrongly)" .)

I've seen this clue in The Globe and Mail.
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