Be first to get to the fore with heavy metal (4,2)
I believe the answer is:
lead on
'be' is the definition.
The answer and definition can be both to do with social activities as well as being verbs in their base form.
Maybe they are linked in a way I don't understand?
'first to get to the fore with heavy metal' is the wordplay.
'first' becomes 'lead' (I've seen this before).
'to get' means one lot of letters go next to another.
'to the fore with heavy metal' becomes 'on' (I can't justify this - if you can you should give a lot more credence to this answer).
'lead'+'on'='LEAD ON'
Can you help me to learn more?
(Other definitions for lead on that I've seen before include "Entice" , "to come first" , "Church roofs have" , "Persuade to do something foolish; trick, deceive" , "Show the way inside" .)