2's girlfriend catches fool seeing another woman (7)

I believe the answer is:

letitia

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'another woman' is the definition.
'Letitia' can be an answer for 'woman'. I am unsure of the 'another' bit.

'2's girlfriend catches fool' is the wordplay.
'e's girlfriend' becomes 'leia' (I can't explain this - if you can you should give a lot more credence to this answer).
'catches' is an insertion indicator.
'fool' becomes 'tit' (I've seen this in other clues).
'leia' enclosing 'tit' is 'LETITIA'.

'seeing' acts as a link.

Can you help me to learn more?

(Other definitions for letitia that I've seen before include "Female" , "Girl" .)

I've seen this clue in The Independent.

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