Call for something such as a book-end (3)

I believe the answer is:

ask

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

'call for' is the definition.
(synonyms)

'as a book-end' is the wordplay.
'end' says to take the final letters.
The final letter of 'book' is 'k'.
'as'+'k'='ASK'

'something such' is the link.
This may not be right. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for ask that I've seen before include "Something demanded" , "Request, invite" , "Pose" , "Seek an answer" , "Issue invitations" .)

I've seen this clue in the Evening Standard.

Want a hint initially instead of a full solution? Install my app