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' says the answer is hidden in the clue.
'INERT' can be found hidden inside 'finer tuning'.

'to do a bit' acts as a link.
I am not very happy about this link. Some or all of it may belong to 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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