The place in which that woman punches partners (5)
I believe the answer is:
where
'the place' is the definition.
(I've seen this before)
'that woman punches partners' is the wordplay.
'that woman' becomes 'her' ('her' refers to a woman).
'punches' means one lot of letters goes inside another (some letters punch a hole in others).
'partners' becomes 'we' (West and East are partners in the game bridge).
'her' placed within 'we' is 'WHERE'.
'in which' acts as a link.
(Other definitions for where that I've seen before include "enquiry" , "A question of place?" , "a question of location" , "At which point" , "In which position?" .)