Senior board member in firm about to get shock? (2-5)

I believe the answer is:

co-chair

'senior board member' is the definition.

'firm about to get shock?' is the wordplay.
'firm' becomes 'co' (a firm is a company).
'about' becomes 'c' (abbreviation for 'circa').
'to get' means one lot of letters go next to another.
'shock?' becomes 'hair' (I've seen this before).
'co'+'c'+'hair'='CO-CHAIR'

'in' acts as a link.

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