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 judge whether this works.

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

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