Completely understand that woman supporting male singer (10)
I believe the answer is:
altogether
'completely' is the definition.
('altogether' can be a synonym of 'completely')
'understand that woman supporting male singer' is the wordplay.
'understand' becomes 'get' (getting is a kind of understanding).
'that woman' becomes 'her' (I've seen this before).
'supporting' says to put letters next to each other (in a down clue, some letters go below others).
'male singer' becomes 'alto' (I've seen this before).
'get'+'her'='gether'
'gether' after 'alto' is 'ALTOGETHER'.
(Other definitions for altogether that I've seen before include "Quite" , "Wholly" , "Completely, on the whole" , "Entirely" , "nude in this" .)