At work rather hot tea leads to conversation? (5-2-5)
I believe the answer is:
heart-to-heart
'conversation?' is the definition.
(intimate conversation)
'at work rather hot tea' is the wordplay.
'at work' indicates an anagram.
'rather'+'hot'+'tea'='ratherhottea'
'ratherhottea' is an anagram of 'HEART-TO-HEART'.
'leads to' is the link.
(Other definitions for heart-to-heart that I've seen before include "Intimate talk" , "Intimate conversation" , "Candid conversation" .)