Pillar bloke is to repair (7)
I believe the answer is:
obelisk
'pillar' is the definition.
(I know that obelisk is a type of pillar)
'bloke is to repair' is the wordplay.
'to repair' indicates anagramming the letters (letters are fixed or repaired).
'bloke'+'is'='blokeis'
'blokeis' with letters rearranged gives 'OBELISK'.
(Other definitions for obelisk that I've seen before include "Cleopatra's Needle, for instance" , "Tall tapering pillar as monument or landmark" , "Tapering square stone monument" , "Eg Cleopatra's Needle" , "Four-sided tapering pillar" .)