One paid to have second puff (5)
I believe the answer is:
promo
'puff' is the definition.
I don't know anything about this answer so I cannot judge whether this works.
'one paid to have second' is the wordplay.
'one paid' becomes 'pro' (I've seen this in other clues).
'to have' means one lot of letters go next to another.
'second' becomes 'mo' (both are short periods of time).
'pro'+'mo'='PROMO'
Can you help me to learn more?
(Other definitions for promo that I've seen before include "Publicity for project or product (abbr)" , "Ad" , "Encouragement" , "Brief publicity" , "for [a] little while" .)