Public transport head acquiring international company (8)
I believe the answer is:
business
'company' is the definition.
(I've seen this before)
'public transport head acquiring international' is the wordplay.
'public transport' becomes 'bus' (bus is a kind of public transport).
'head' becomes 'ness' (ness is a headland).
'acquiring' indicates putting letters inside.
'international' becomes 'i' (abbreviation eg in IMF).
'bus'+'ness'='busness'
'busness' going around 'i' is 'BUSINESS'.
(Other definitions for business that I've seen before include "See 1" , "Occupation; concern" , "Commercial unit or activity" , "Commerce, trade" , "Baby" .)