Public relations securing housing contract is source of gratification (7)
I believe the answer is:
pleaser
'source of gratification' is the definition.
The definition suggests a singular noun which matches the answer.
'public relations securing housing contract' is the wordplay.
'public relations' becomes 'PR' (abbreviation).
'securing' indicates putting letters inside.
'housing contract' becomes 'lease' (lease on a property).
'pr' placed around 'lease' is 'PLEASER'.
'is' is the link.
Can you help me to learn more?
(Other definitions for pleaser that I've seen before include "One trying to make others happy" , "someone to whom gratitude is due" , "One satisfying" .)