Select times for admission to A&E? That's ground-breaking! (7)
I believe the answer is:
pickaxe
'that's ground-breaking' is the definition.
I can't judge whether this defines the answer.
'select times for admission to ae?' is the wordplay.
'select' becomes 'pick' (picking is a kind of selecting).
'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 "Mattock" , "Pointed digging tool" , "which may cause rocky break-up" , "Tool to break rocks" , "weapon" .)