Boys getting cut on a mountain (5)
I believe the answer is:
loads
'a mountain' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.
'boys getting cut on' is the wordplay.
'boys' becomes 'lads' (lad is a kind of boy).
'getting' is an insertion indicator.
'cut on' becomes 'o' (I can't justify this - if you can you should give a lot more credence to this answer).
'lads' enclosing 'o' is 'LOADS'.
Can you help me to learn more?
(Other definitions for loads that I've seen before include "a lot" , "Oodles (informal)" , "very much" , "Puts on weight" , "Tons, oodles" .)