Stickers of Independent politician found during checks (7)
I believe the answer is:
limpets
'stickers' is the definition.
(limpets 'stick' to things)
'independent politician found during checks' is the wordplay.
'independent' becomes 'i'.
'politician' becomes 'mp'.
'found during' indicates putting letters inside.
'checks' becomes 'lets' ('let' could historically mean an obstruction).
'i'+'mp'='imp'
'imp' put within 'lets' is 'LIMPETS'.
'of' is the link.
(Other definitions for limpets that I've seen before include "'Molluscs, they cling to rocks (7)'" , "Proverbially clingy marine gastropods" , "Marine molluscs that cling tightly to rocks" .)