Robin, perhaps alert in shot (7)
I believe the answer is:
reliant
'robin perhaps' is the definition.
I can't tell whether this definition defines the answer.
'alert in shot' is the wordplay.
'shot' indicates an anagram.
'alert'+'in'='alertin'
'alertin' is an anagram of 'RELIANT'.
Can you help me to learn more?
(Other definitions for reliant that I've seen before include "Inspiring confidence" , "Depending on another for support" , "car firm" , "Depending (upon)" , "Robin was one < in need of support" .)