I'm entering an amazing plus one - just came naturally (2,7)
I believe the answer is:
on impulse
'came naturally' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.
'i'm entering an amazing plus one' is the wordplay.
'entering' is an insertion indicator.
'an amazing' indicates an anagram.
'plus'+'one'='plusone'
'plusone' anagrammed gives 'onpulse'.
'im' inserted inside 'onpulse' is 'ON IMPULSE'.
'just' is the link.
Can you help me to learn more?
(Other definitions for on impulse that I've seen before include "without forethought" , "Spontaneously" , "Without premeditation or planning, perhaps buying" , "Without thinking" .)