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' indicates putting letters inside.
'old' becomes 'o' (abbreviation).
'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" .)