Top heavy rowing team's stature (6)
I believe the answer is:
height
'stature' is the definition.
(synonyms)
'top heavy rowing team's' is the wordplay.
'top' suggests taking the first letters (in a down clue, the first letter is top).
'rowing team' becomes 'eight' (I've seen this before).
The initial letter of 'heavy' is 'h'.
'h'+'eight'='HEIGHT'
(Other definitions for height that I've seen before include "Vertical dimension" , "Peak" , "size up?" , "Dimension from top to bottom" , "Loftiness" .)