Crossword Genius

Robin, perhaps alert in shot (7)

Ross

I believe the answer is:

reliant

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'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" .)

I've seen this clue in The Independent.
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