Haphazard young woman struck gold first (3-2-4)
I believe the answer is:
hit-or-miss
'haphazard' is the definition.
(I know that haphazard can be written as hit-or-miss)
'young woman struck gold first' is the wordplay.
'young woman' becomes 'miss' (title for a young woman).
'struck' becomes 'hit' (I've seen this in another clue).
'gold' becomes 'or' ('or' is the heraldic name for gold).
'first' says to put letters next to each other.
'hit'+'or'='hitor'
'miss' after 'hitor' is 'HIT-OR-MISS'.
(Other definitions for hit-or-miss that I've seen before include "Haphazard, random" , "Of method, erratic or random" .)