Fringe benefit (4)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">fringe benefit</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for perk that I've seen before include "Incidental benefit from one's employment" , "Company car, for example" , "Fringe benefit" , "extra privilege" , "Cheer" .)
(Other definitions for frill that I've seen before include "Shared feature of Mr Punch, Richard III" , "Ruff, adornment" , "Pleated strip of cloth trimming or an unnecessary extra" , "Extra embellishment" , "Ruche; ruff" .)