Firm welcoming head of informatics with new cushy job (8)
I believe the answer is:
sinecure
'cushy job' is the definition.
(I've seen this before)
'firm welcoming head of informatics with new' is the wordplay.
'firm' becomes 'secure' ('secure' can be similar in meaning to 'firm'**).
'welcoming' means one lot of letters goes inside another (in sense of 'inviting in').
'head of' says to take the initial letters.
'with' means one lot of letters go next to another.
'new' becomes 'n'.
The first letter of 'informatics' is 'i'.
'i'+'n'='in'
'secure' enclosing 'in' is 'SINECURE'.
(Other definitions for sinecure that I've seen before include "Paid job with minimal work - insecure (anag)" , "Informally, a bobby's job" , "Post requiring little work" , "Paid job involving little or no work" , "Office that involves minimal duties" .)