Crossword Genius

Heating unit for the Royal Marines (5)

Ross

I believe the answer is:

therm

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

'heating unit' is the definition.
'therm' can be an answer for 'unit' (therm is a kind of unit). I am not certain of the 'heating' bit.

'the royal marines' is the wordplay.
'royal marines' becomes 'rm'.
'the'+'rm'='THERM'

'for' is the link.

Can you help me to learn more?

(Other definitions for therm that I've seen before include "Amount of heat" , "Unit of heat used in the UK as the basis of gas bills" , "Gasman's unit" , "Unit of heat and gas measure" , "Former gas supply unit" .)

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