Crossword Genius

I invested in mobile top-up loan for residents (10)

Ross

I believe the answer is:

population

'residents' is the definition.

'i invested in mobile top-up loan' is the wordplay.
'invested in' means one lot of letters goes inside another.
'mobile' is an anagram indicator.
'top'+'up'+'loan'='topuploan'
'topuploan' anagrammed gives 'populaton'.
'i' going inside 'populaton' is 'POPULATION'.

'for' is the link.

(Another definition for population that I've seen is " inhabitants".)

I've seen this clue in The Telegraph.
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