Engineers involved with plant’s rebirth (13)
I believe the answer is:
reincarnation
'rebirth' is the definition.
(synonyms)
'engineers involved with plant's' is the wordplay.
I cannot really see how this works, but
'engineers' could be 're' (Royal Engineers) and 're' is found within the answer.
'involved' could be 'in' (to be involved in something is to be 'in' it) and 'in' is found within the answer.
'plant' could be 'carnation' (carnation is a flower) and 'carnation' is present in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for reincarnation that I've seen before include "getting new body" , "revised version" , "Embodiment of a soul in a new form after death" , "Soul's rebirth in another body" , "Rebirth (of a soul)" .)