Worship one in a dream, possibly (6)
I believe the answer is:
admire
'worship' is the definition.
(thesaurus)
'one in a dream possibly' is the wordplay.
'one' becomes 'i' (Roman numeral).
'in' means one lot of letters goes inside another.
'possibly' indicates anagramming the letters.
'dream' is an anagram of 'admre'.
'i' going inside 'admre' is 'ADMIRE'.
(Other definitions for admire that I've seen before include "Esteem, have high regard for" , "Look at (someone or something) with pleasure" , "like very much" , "Revere" , "Idolise" .)