Crossword Genius

In agreement negotiating is done (6)

Ross

I believe the answer is:

onside

'in agreement' is the definition.
(I've seen this before)

'negotiating is done' is the wordplay.
'negotiating' indicates anagramming the letters (I've seen 'negotiated' mean this).
'is'+'done'='isdone'
'isdone' is an anagram of 'ONSIDE'.

(Other definitions for onside that I've seen before include "(In football) not in forbidden zone" , "in a good position" , "in a position to score?" , "Legally positioned at football etc" , "in a permitted position in sport" .)

I've seen this clue in The Telegraph.
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