Chaps with the right angle on publicity (4)
I believe the answer is:
lads
'chaps' is the definition.
('lad' can be a synonym of 'chap')
'the right angle on publicity' is the wordplay.
'the right angle' becomes 'l'.
'on' means one lot of letters go next to another.
'publicity' becomes 'ads' (advert).
'l'+'ads'='LADS'
'with' is the link.
(Other definitions for lads that I've seen before include "Young men" , "Youngsters" , "Fellows, blokes" , "Fellows, chaps" , "Boys, young fellows" .)