Come to a conclusion about Uncle Dicky, social media promoter (10)

'social media promoter' is the definition.
(influencers promote things on social media)

'come to a conclusion about uncle dicky' is the wordplay.
'come to a conclusion' becomes 'infer' (I've seen this before).
'about' is an insertion indicator.
'dicky' is an anagram indicator (dicky can mean ill or non-functioning).
'uncle' is an anagram of 'luenc'.
'infer' enclosing 'luenc' is 'INFLUENCER'.