Burst of energy? Possibly, shrugs au pair evenly (5,4)

I believe the answer is:

sugar rush

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'burst of energy?' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.

'possibly shrugs au pair evenly' is the wordplay.
'possibly' indicates an anagram.
'evenly' means one should take alternating letters (the letters in even-numbered positions).
'au'+'pair'='aupair'
The alternate letters of 'aupair' are 'uar'.
'shrugs'+'uar'='shrugsuar'
'shrugsuar' anagrammed gives 'SUGAR RUSH'.

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