Sportswear company's commercial concepts essentially lacking (6)
I believe the answer is:
adidas
'sportswear company's' is the definition.
(I've seen this before)
'commercial concepts essentially lacking' is the wordplay.
'commercial' becomes 'ad' (abbreviation for advertisement).
'concepts' becomes 'ideas' (I've seen this before).
'essentially lacking' says to hollow out the word (remove centre letters).
'ideas' with its centre removed is 'idas'.
'ad'+'idas'='ADIDAS'
(Other definitions for adidas that I've seen before include "Sportswear company" , "kit supplier" .)