A couple of Conservatives beside English ship wanting admittance (6)
I believe the answer is:
access
'admittance' is the definition.
(synonyms)
'a couple of conservatives beside english ship' is the wordplay.
'couple of' says to double the letters.
'conservatives' becomes 'C' (abbreviation in UK politics).
'beside' says to put letters next to each other (I've seen this in other clues).
'english' becomes 'e' (abbreviation).
'ship' becomes 'SS' (prefix in ship names eg SS Great Britain).
'c' doubled is 'cc'.
'a'+'cc'+'e'+'ss'='ACCESS'
'wanting' is the link.
(Other definitions for access that I've seen before include "Means, or right, of approach" , "outburst" , "The right to see, eg, children after divorce" , "Way of entering or leaving" , "Credit" .)