Juxtapose attention with old politician (7)
I believe the answer is:
compare
'juxtapose' is the definition.
(thesaurus)
'attention with old politician' is the wordplay.
'attention' becomes 'care' (synonyms).
'with' means one lot of letters goes inside another.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'politician' becomes 'MP' (Member of Parliament).
'o'+'mp'='omp'
'care' going around 'omp' is 'COMPARE'.
(Other definitions for compare that I've seen before include "Look at differences and similarities between (things)" , "what discriminators do" , "Contrast - liken" , "Represent as similar; sounds like emcee" .)