Foolish investors quit without pounds? Their partners are dummies (14)

I believe the answer is:

ventriloquists

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'partners are dummies' is the definition.
I can't judge whether this defines the answer.

'foolish investors quit without pounds?' is the wordplay.
'foolish' indicates an anagram (a foolish spelling).
'without' is an insertion indicator ('without' can be similar in meaning to 'outside').
'pounds?' becomes 'l' (L can represent the monetary pound).
'investors'+'quit'='investorsquit'
'investorsquit' with letters rearranged gives 'ventrioquists'.
'ventrioquists' enclosing 'l' is 'VENTRILOQUISTS'.

'their' is the link.

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I've seen this clue in The Guardian.

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