Crossword Genius

Might this cause rocky break-up? Choose times for admission to AE (7)

Ross

I believe the answer is:

pickaxe

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

'might this cause rocky break-up?' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

'choose times for admission to ae' is the wordplay.
'choose' becomes 'pick' (picking is a kind of choosing).
'times' becomes 'x' (2 times 4 is 2 x 4).
'for admission' is an insertion indicator (inserted letters are let in or admitted).
'x' placed inside 'ae' is 'axe'.
'pick'+'axe'='PICKAXE'

Can you help me to learn more?

(Other definitions for pickaxe that I've seen before include "which may cause rocky break-up" , "Tool to break rocks" , "it's needed to break new ground" , "Tool with a wooden handle and a heavy curved metal head" , "long-handled tool" .)

I've seen this clue in The Telegraph.
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