Ticked off single price (5)
I believe the answer is:
irate
'ticked' is the definition.
(I've seen this in another clue)
'single price' is the wordplay.
'single' becomes 'I' (one).
'price' becomes 'rate' (I've seen this before).
'i'+'rate'='IRATE'
'off' is the link.
(Other definitions for irate that I've seen before include "Magical rod" , "Angry - furious" , "Wrathful" , "will be up in arms" , "Annoyed, nettled" .)