Getting tense over money – bother! (7)

I believe the answer is:

trouble

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'bother' is the definition.
(synonyms)

'getting tense over money' is the wordplay.
'getting tense over' becomes 't' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'money' becomes 'rouble ' (I've seen this before).
't'+'rouble'='TROUBLE'

Can you help me to learn more?

(Other definitions for trouble that I've seen before include "Worry - predicament" , "Jam" , "Difficulty, problems" , "Pains" , "Conflict" .)

I've seen this clue in The Everyman puzzle in The Observer.

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