150 workers end squatting inside — demanding types (9)

I believe the answer is:

claimants

'demanding types' is the definition.

'150 workers end squatting inside' is the wordplay.
'150' becomes 'cl'.
'workers' becomes 'ants' (I've seen this before).
'end' becomes 'aim' (aim is a kind of end).
'squatting inside' indicates putting letters inside.
'cl'+'ants'='clants'
'clants' placed around 'aim' is 'CLAIMANTS'.

I've seen this clue in The Guardian.

Want a hint initially instead of a full solution? Install my app