Those under fire hit at front in Scottish squad (7)
I believe the answer is:
hearths
'those under fire' is the definition.
I can't tell whether this defines the answer.
'hit at front in scottish squad' is the wordplay.
'at front' says to take the initial letters.
'in' indicates putting letters inside.
'scottish squad' becomes 'hearts' (I can't justify this - if you can you should believe this answer much more).
The first letter of 'hit' is 'h'.
'h' inserted inside 'hearts' is 'HEARTHS'.
Can you help me to learn more?
(Other definitions for hearths that I've seen before include "Fireplace areas" , "Firesides" .)