Popular vlogger's debut on Instagram - to speak and energise (10)
I believe the answer is:
invigorate
'energise' is the definition.
(I know that invigorate is a more specific form of energise)
'popular vlogger's debut on instagram to speak' is the wordplay.
'popular' becomes 'in' ('in' can mean trendy).
'debut' indicates taking the first letters.
'on' means one lot of letters go next to another.
'instagram' becomes 'ig' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'to speak' becomes 'orate' (orating is a kind of speaking).
The first letter of 'vlogger' is 'v'.
'in'+'v'+'ig'+'orate'='INVIGORATE'
'and' is the link.
Can you help me to learn more?
(Other definitions for invigorate that I've seen before include "Liven up" , "Perk up" , "Strengthen" , "Give strength to" , "Give energy to" .)