Soft-hearted person posted current crew thanks and tip (14)
I believe the answer is:
sentimentalist
'soft-hearted person' is the definition.
(a sentimental or emotional person)
'posted current crew thanks and tip' is the wordplay.
'posted' becomes 'sent' ('send' can be a synonym of 'post').
'current crew' becomes 'imen' (I can't explain this - if you can you should give a lot more credence to this answer).
'thanks' becomes 'ta' (UK informal version of 'thank you').
'and' means one lot of letters go next to another.
'tip' becomes 'list' (both can mean to tilt).
'sent'+'imen'+'ta'+'list'='SENTIMENTALIST'
(Other definitions for sentimentalist that I've seen before include "Romantic" , "Being overemotional" , "Nostalgic chap" , "Soppy person" , "One who's sloppy" .)