Shop finally directs petitions (6)
I believe the answer is:
pleads
'petitions' is the definition.
(to petition someone is to plead with them)
'shop finally directs' is the wordplay.
'finally' says to take the final letters.
'directs' becomes 'leads' (direct can mean to lead someone somewhere).
The last letter of 'shop' is 'p'.
'p'+'leads'='PLEADS'
(Other definitions for pleads that I've seen before include "Implores" , "Appeals or requests earnestly" , "Begs" , "Makes appeal or entreaty" .)