Vagrant from Paddington say, collecting two grand (6)
I believe the answer is:
beggar
'vagrant' is the definition.
(I've seen this before)
'paddington say collecting two grand' is the wordplay.
'paddington say' becomes 'bear' (fictional character Paddington Bear).
'collecting' means one lot of letters goes inside another.
'two' shows that letters should be duplicated.
'grand' becomes 'g' (synonyms).
'g' doubled is 'gg'.
'bear' going around 'gg' is 'BEGGAR'.
'from' is the link.
(Other definitions for beggar that I've seen before include "poor bloke" , "One cannot be a chooser" , "One seeking alms" , "One lives by asking for money or food" , "Solicitor" .)