Calling up first female, agreeing to replace the last (7)
I believe the answer is:
evoking
'calling up' is the definition.
('evoke' can be a synonym of 'call up')
'first female agreeing to replace the last' is the wordplay.
'first female' becomes 'v' (I can't justify this - if you can you should give a lot more credence to this answer).
'agreeing' becomes 'oking' (to OK something is to agree to it).
'to' means one lot of letters go next to another (I've seen this in other clues).
'the last' suggests the final letters.
The final letter of 'replace' is 'e'.
'v'+'oking'='voking'
'voking' after 'e' is 'EVOKING'.
(Other definitions for evoking that I've seen before include "Bringing to mind" , "Calling up, emotions say" , "Calling up memory or emotion" , "Summoning" , "conjuring" .)