Group attending talks showing no aptitude for negotiation (10)

I believe the answer is:

deputation

'group attending talks' is the definition.
(as in a deputation at a conference)

'no aptitude for negotiation' is the wordplay.
'for negotiation' indicates an anagram (a new arrangement of letters is negotiated).
'no'+'aptitude'='noaptitude'
'noaptitude' with letters rearranged gives 'DEPUTATION'.

'showing' acts as a link.

(Another definition for deputation that I've seen is " envoys".)

I've seen this clue in The Telegraph.

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