### Clue: Tin containing a beer full of energy and cheer (12)
### Answer: SANGUINENESS 
 ### Explanation: Tin containing a beer full of energy and cheer (12)
**Sn** (chemicla symbol for "tin") containing **A** + **GUINNESS** ("beer") full of **E**(nergy), so S(A)N-GUIN(E)NESS