Warning given by small number touring Oklahoma (5)
I believe the answer is:
token
'warning given by small' is the definition.
Both the definition and answer are adjectives. Maybe there's a link between them I don't understand?
'number touring oklahoma' is the wordplay.
'number' becomes 'ten' (ten is a kind of number).
'touring' indicates putting letters inside (tour can mean to go around).
'oklahoma' becomes 'ok' (abbreviation for the US state).
'ten' placed around 'ok' is 'TOKEN'.
Can you help me to learn more?
(Other definitions for token that I've seen before include "Voucher (for, eg, books)" , "Sign, maybe substitute for the real thing" , "signal" , "Shopping voucher" , "Nominal, slight" .)