Sit out occasionally on bulkhead - or what's left of it (4)
I believe the answer is:
stub
'what's left of it' is the definition.
I can't tell whether this definition defines the answer.
'sit out occasionally on bulkhead' is the wordplay.
'occasionally' means one should take alternating letters (letters taken at regular intervals or occasions).
'on' is a charade indicator (letters next to each other).
'bulkhead' becomes 'b' (head letter of 'bulk').
'sit'+'out'='sitout'
The alternating letters of 'sitout' are 'stu'.
'stu'+'b'='STUB'
'or' is the link.
Can you help me to learn more?
(Other definitions for stub that I've seen before include "what smoker drops in street?" , "Counterfoil - fag end" , "Short piece left over" , "Ticket counterfoil" , "Wee bit of pencil, eg," .)