In sport, it's no long shot (5)

I believe the answer is:
tapin
'shot' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.
'in sport it's no long' is the wordplay.
'in' means one lot of letters goes inside another.
'sport' indicates anagramming the letters.
'no' becomes 'n' (common abbreviation).
'long' becomes 'ap' (I can't justify this - if you can you should give a lot more credence to this answer).
'it'+'n'='itn'
'itn' is an anagram of 'tin'.
'tin' going around 'ap' is 'TAPIN'.
Can you help me to learn more?
(Another definition for tapin that I've seen is " Easy goal".)
