Military type pays for senior to acquire island (11)

I believe the answer is:

footsoldier

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

'military type' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'pays for senior to acquire island' is the wordplay.
'pays for' becomes 'foots' (as in footing the bill).
'senior' becomes 'older' (senior can mean the older of two people).
'to acquire' is an insertion indicator.
'island' becomes 'i' (geographical abbreviation).
'older' going around 'i' is 'oldier'.
'foots'+'oldier'='FOOTSOLDIER'

Can you help me to learn more?

(Another definition for footsoldier that I've seen is " not up for the fight".)

I've seen this clue in The Irish Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.