Call up first lady to get outside approval (5)

I believe the answer is:

evoke

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

'call up' is the definition.
('evoke' can be a synonym of 'call up')

'first lady to get outside approval' is the wordplay.
'first lady' becomes 'eve' (I've seen this before).
'to get' means one lot of letters goes inside another.
'outside approval' becomes 'ok' (OK is an example. I am not sure about the 'outside' bit.**).
'eve' placed around 'ok' is 'EVOKE'.

Can you help me to learn more?

(Other definitions for evoke that I've seen before include "Elicit (a response)" , "call-up" , "Kindle (memory)" , "Bring (a thing) to mind" , "Conjure up" .)

I've seen this clue in The Guardian.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.