Powerless to do a bit of finer tuning (5)

I believe the answer is:

inert

I'm a little stuck... Click here to teach me more about this clue!

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

'of finer tuning' is the wordplay.
'of' indicates a hidden word.
'INERT' can be found hidden inside 'finer tuning'.

'to do a bit' is the 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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