Crossword Genius

Slam the grant distributed with disinterest (2,4,6)

Ross

I believe the answer is:

at arms length

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

'slam the grant distributed with disinterest' is the definition.
I can't tell whether this definition defines the answer.

'slam the grant distributed' is the wordplay.
'distributed' indicates an anagram.
'slam'+'the'+'grant'='slamthegrant'
'slamthegrant' is an anagram of 'AT ARMS LENGTH'.

Can you help me to learn more?

(Other definitions for at arms length that I've seen before include "(Kept) distant" , "Avoiding close contact" , "with size of weapon" , "through intermediary" , "At a distance" .)

I've seen this clue in the Sydney Morning Herald.
Want a hint initially instead of a full solution? Install my app