Powerless to do a bit of finer tuning (5)

I believe the answer is:

inert

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'powerless' is the definition.
(I've seen this in another clue)

'of finer tuning' is the wordplay.
'of' indicates the answer is hidden within the clue.
'INERT' is hidden within 'finer tuning'.

'to do a bit' acts as a link.
This may not be right. Some or all of it may be part of another bit of the clue.

Can you help me to learn more?

(Other definitions for inert that I've seen before include "dead" , "Indolent - unreactive" , "Like some gases" , "Leaden" , "Chemically inactive" .)

I've seen this clue in the Evening Standard.

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