Information given by party training (4)
I believe the answer is:
dope
'information' is the definition.
(dope is a kind of information)
'by party training' is the wordplay.
'by' means one lot of letters go next to another.
'party' becomes 'do' (do is a kind of party).
'training' becomes 'pe'.
'do' next to 'pe' is 'DOPE'.
'given' acts as a link.
(Other definitions for dope that I've seen before include "Fool - model aeroplane varnish" , "Sucker" , "Fool - cannabis" , "Lowdown; drugs (informal)" , "Drug - information" .)