Complain and keep tabs on useless old line manager (9)

I believe the answer is:

railtrack

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'useless old line manager' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'complain and keep tabs on' is the wordplay.
'complain' becomes 'rail' (railing is a kind of complaining).
'and' means one lot of letters go next to another.
'keep tabs on' becomes 'track' (I've seen this in another clue).
'rail'+'track'='RAILTRACK'

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