Engineers, kind, from popular holiday destination (6)
I believe the answer is:
resort
'holiday destination' is the definition.
(I've seen this before)
'engineers kind' is the wordplay.
'engineers' becomes 're' (Royal Engineers).
'kind' becomes 'sort' (synonyms).
're'+'sort'='RESORT'
'from popular' is the link.
This may not be right. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for resort that I've seen before include "Holiday destination" , "Where tourists go" , "haunt" , "Make an anagram of" , "Holiday town" .)