Particular copper having bar turned over after place emptied (8)
I believe the answer is:
peculiar
'particular' is the definition.
(synonyms)
'copper having bar turned over after place emptied' is the wordplay.
'copper' becomes 'Cu' (Cu is the chemical symbol for copper).
'having bar' becomes 'rail' (I am not sure about this - if you are sure you should believe this answer much more).
'turned over' says the letters should be written backwards.
'after' says to put letters next to each other.
'emptied' means to remove the middle letters.
'place' with its middle removed is 'pe'.
'rail' back-to-front is 'liar'.
'cu'+'liar'='culiar'
'culiar' put after 'pe' is 'PECULIAR'.
Can you help me to learn more?
(Other definitions for peculiar that I've seen before include "Strange or eccentric, quite odd" , "Belonging exclusively to, person or place" , "Extraordinary" , "Unusual" , "'Strange, odd (8)'" .)