Centre of attention following firm’s return to America (5)
I believe the answer is:
focus
'centre of attention' is the definition.
(I've seen this before)
'following firm's return to america' is the wordplay.
'following' becomes 'f' (used when citing page numbers etc).
'firm' becomes 'co' (a firm is a company).
'return' is a reversal indicator.
'to america' becomes 'US' (United States).
'co' backwards is 'oc'.
'f'+'oc'+'us'='FOCUS'
(Other definitions for focus that I've seen before include "Hub" , "Concentrate the vision" , "Point at which light rays converge or diverge" , "Concentrate, centre attention" , "Central point" .)