Boarders finding number of insects (7)
I believe the answer is:
tenants
'boarders' is the definition.
(I've seen this in another clue)
'number of insects' is the wordplay.
'number' becomes 'ten' (ten is a kind of whole number).
'of insects' becomes 'ants' (I can't justify this - if you can you should give a lot more credence to this answer).
'ten'+'ants'='TENANTS'
'finding' is the link.
Can you help me to learn more?
(Other definitions for tenants that I've seen before include "residents" , "They pay rent" , "Occupiers" , "Lodgers" .)