Stupid woman got briefly married (3)
I believe the answer is:
dim
'stupid' is the definition.
(similar in meaning)
'woman got briefly married' is the wordplay.
'woman' becomes 'di' (short for Diana).
'got' is a charade indicator (letters next to each other).
'briefly married' becomes 'm' (abbreviation, e.g. in genealogy; 'briefly' suggests an abbreviation).
'di'+'m'='DIM'
(Other definitions for dim that I've seen before include "Not very bright or intelligent" , "Badly lit or not so bright" , "thick" , "Vague" , "Not bright, cloudy" .)