Soldier in ditch, last of five saved by nurse (9)

'soldier' is the definition.
(I know that Carbineer is a type of rifleman)

'ditch last of five saved by nurse' is the wordplay.
'ditch' becomes 'bin' (both can mean to reject or throw away).
'last of' indicates one should take the final letters.
'saved by' means one lot of letters goes inside another (I've seen this in other clues).
'nurse' becomes 'carer' (a nurse cares for patients).
The final letter of 'five' is 'e'.
'bin'+'e'='bine'
'bine' going into 'carer' is 'CARBINEER'.

'in' acts as a link.