Awfully clear to me that person's been held up? (9)
I believe the answer is:
latecomer
'person's been held up?' is the definition.
I can't tell whether this definition defines the answer.
'awfully clear to me' is the wordplay.
'awfully' is an anagram indicator.
'clear'+'to'+'me'='cleartome'
'cleartome' with letters rearranged gives 'LATECOMER'.
'that' is the link.
Can you help me to learn more?
(Other definitions for latecomer that I've seen before include "Unpunctual type o" , "Recent or tardy arrival" , "one's a poor timekeeper" , "Person arriving behind time" , "One who arrives tardily, not punctually" .)