Decorate UK sailors after fuss (5)
I believe the answer is:
adorn
'decorate uk' is the definition.
'adorn' can be an answer for 'decorate' (synonyms). I am not certain of the 'uk' bit.
'sailors after fuss' is the wordplay.
'sailors' becomes 'RN' (abbreviation for Royal Navy).
'after' says to put letters next to each other.
'fuss' becomes 'ado' (synonyms).
'rn' put after 'ado' is 'ADORN'.
Can you help me to learn more?
(Other definitions for adorn that I've seen before include "Improve appearance" , "Bedeck" , "dress" , "get dressed!" , "Festoon" .)