Crossword Genius

A certain military group getting some heat (5)

Ross

I believe the answer is:

therm

'some heat' is the definition.
(Therm is a unit of heat energy)

'a certain military group getting' is the wordplay.
'a certain' becomes 'the' (definite article - refers to a certain object).
'military group' becomes 'RM' (Royal Marines).
'getting' means one lot of letters go next to another.
'the'+'rm'='THERM'

(Other definitions for therm that I've seen before include "Unit of heat as in gas supply" , "Unit of measurement of heat" , "Indicator of heat" , "Amount of heat" , "it measures heat" .)

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