One who accepts teak could be right (5)
I believe the answer is:
taker
'one who accepts' is the definition.
(someone who takes or accepts something)
'teak could be right' is the wordplay.
'could be' is an anagram indicator.
'right' becomes 'r' (abbreviation).
'teak' with letters rearranged gives 'take'.
'take'+'r'='TAKER'
(Other definitions for taker that I've seen before include "Person accepting an offer" , "one's prepared to bet" , "(Challenge) acceptor" , "Could be a thief" , "He accepts" .)