Union-based strike rejected by Congress and a Liberal (7)
I believe the answer is:
marital
'union-based' is the definition.
I can't judge whether this definition defines the answer.
'strike rejected by congress and a liberal' is the wordplay.
'strike' becomes 'ram' (I've seen this before).
'rejected' is a reversal indicator.
'by congress' becomes 'it' (congress can mean sex. I am not sure about the 'by' bit.).
'and' means one lot of letters go next to another.
'liberal' becomes 'l' (abbreviation).
'ram' back-to-front is 'mar'.
'mar'+'it'+'a'+'l'='MARITAL'
Can you help me to learn more?
(Other definitions for marital that I've seen before include "related to union" , "Conjugal" , "Connubial" , "to do with couple's relationship" , "Maybe husband's" .)