Possible Clues:

• Fluid - a sample endlessly being circulated
• Modern TV type
• Yellow liquid in blood
• Part of blood; ionised material
• Paternal grandmother injected with last of hospital's blood fluid
• Transfusion liquid
• Screen in place, a mini with no lines showing
• The watery part of the blood
• As for mother hiding behind place? It's in her blood
• Patrol leader like mother - it's in the blood