Tanker docked in cleaner hot spot (6,4)

I believe the answer is:

boiler room

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'hot spot' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'tanker docked in cleaner' is the wordplay.
I cannot really see how this works, but
'tanker' could be 'oiler' (synonyms) and 'oiler' is found within the answer.
'cleaner' could be 'broom' (I've seen this before) and 'broom' is located in the remaining letters.
No letters remain.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in the Evening Standard.

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