Call up woman protecting old king (5)
I believe the answer is:
evoke
'call up' is the definition.
('evoke' can be a synonym of 'call up')
'woman protecting old king' is the wordplay.
'woman' becomes 'eve' (Eve is an example**).
'protecting' means one lot of letters goes inside another.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'king' becomes 'k'.
'o'+'k'='ok'
'eve' enclosing 'ok' is 'EVOKE'.
(Other definitions for evoke that I've seen before include "Arouse" , "Induce" , "bring forth" , "Conjure up" , "Prompt" .)