Time Keir reformed accessible transport (5)
I believe the answer is:
trike
'accessible transport' is the definition.
'trike' can be an answer for 'transport' (trike is a kind of transport). I'm not certain of the 'accessible' bit.
'time keir reformed' is the wordplay.
'time' becomes 't' (abbreviation).
'reformed' indicates an anagram.
'keir' is an anagram of 'rike'.
't'+'rike'='TRIKE'
Can you help me to learn more?
(Other definitions for trike that I've seen before include "transport system" , "Tricycle (inf.)" , "Briefly solvent" , "Three-wheeled vehicle" , "Three-wheeler" .)