Beneficiary follows tip from two of those people (5)
I believe the answer is:
their
'of those people' is the definition.
(I've seen this before)
'beneficiary follows tip from two' is the wordplay.
'beneficiary' becomes 'heir' (I've seen this in another clue).
'follows' means one lot of letters go next to another.
'tip from' suggests taking the first letters.
The first letter of 'two' is 't'.
'heir' put after 't' is 'THEIR'.
(Other definitions for their that I've seen before include "Possessive pronoun" , "Those people's" , "Some would say his (or her)" , "Relating to them" , "belonging to an individual" .)