Dicky clear about new soldier (6)
I believe the answer is:
lancer
'soldier' is the definition.
(I know that lancer is a type of cavalryman)
'dicky clear about new' is the wordplay.
'dicky' is an anagram indicator (dicky can mean ill or non-functioning).
'about' means one lot of letters goes inside another.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'clear' is an anagram of 'lacer'.
'lacer' going around 'n' is 'LANCER'.
(Other definitions for lancer that I've seen before include "Former cavalryman" , "Cavalry soldier" , "Spearman (as in dance?)" .)