Player at Twickenham the focus of indecent remark (6)
I believe the answer is:
centre
'player at twickenham' is the definition.
(rugby position - Twickenham is a rugby venue)
'focus of indecent remark' is the wordplay.
'focus of' indicates the answer is hidden within the clue (focus can mean the centre of something).
'CENTRE' is hidden in the letters of 'indecent remark'.
'the' is the link.
(Other definitions for centre that I've seen before include "- forward; - punch" , "See 1" , "Midpoint" , "Point equidistant from all other points" , "The point equidistant from everywhere" .)